Machine tool



.Patented Feb. 20, 1945 UNITED STATES PATE-NT GF-FICE MACHINETOOL .John Jesionowski, Hartford, Conn, I, h ,I App'licationfseptember 10, 1942, .Serial No. '457,865

+1 Claims.

My invention relates yto machine too'ls.

In the use of 'such ftools as external grinders, diiculty has heretofore v'been 'experienced with wear at the opposite Iends'of the under, `or bed, vframe on which the-work vsupport y'is reci-procabl'y mounted. This ywear 'results from the vdisplacement of the weight during the :alternate move-kv ments of the 'wo-rk support to vopposite ends Loi the bed frame, and the heavier the workpiece Ibeingoperatedupon, the greater has b'een the wear at these ropposite ends. Further, this Wear lis also increased bythe entry `lof fdirt and other abrasive material between this fir-ame and the work support slidable thereon, #and results in the wearing 'oi of sloping end portions. `When thus worn off at the ends, unless the under frame or bed Ei-s scraped in such manner vas to return lits top surface 'to its proper .flat form, the grinder "is incapablo of further accurate '-work. T'Further, the scraping operation is 'a time 'consuming and expensive one, ynec'essitatin'g the grinder fbeing out of use :for a su'lzistarnaial period, and such 'aiscrape ing operation moreover one 'which is forily capahle .of being performed by :specially 'skilled mechanics.

My invention :has among 'its objects to provide an improved 'construction whereby such wear=up on the ends of the under frame :of fa tool including such 'a 'rec'ipr'ocable element, tis eliminated. My invention also has -amongits objects to'prov-id'exan improved work yfeeding smeans :tor a grinder or other like machine, whereby the ,previous difficuity with wearing on :such sloping portions :is overcome, and, more particularly, to :provide such improved :feeding means having improved rmov-v able `supporting mean-s for :the =work .support which maintain the latter adequately supported in all .longitudinal positions 4of the-:same in fsuch manner .as vto prevent such `excessive wear fat the ends .of its tra-vel. -A further yobject of my invention is fto provide such improved work 'support supporting and eedi-ng means comprising improved-oscillating :rolls or supporting y.members for the work support which travel lvs /ith Athe latter during-its 4longitudinal movement. -Other :objects are .to Yprovide-such improved rollsadapted-to provide an adequate extensible support for -the work support in all positions 'thereof in such tmanner asto eliminate the previous difficulty with -heavy overhanging vweight .at the ends of its travel, and further toprovide such rolls which 'are so movable relative to :the work support :assi-n ialladilierent positions -of the rolls :to "continue t0 SllpDDrt the work .support both vadjacentits :ends and fat ,di-

rolls: A s'till further object of my invention listo provide such animproved construction wherein the `'length of the vmachine yrequired for a `given travel of the work support iis :substantially decreased as :compared with exi-sting grinders. Other vobjects include theiiprovision of an improved mechanism having v-the Ladvantages aforesaid and having improved vcontrolling mechanism for the 'several mechanisms tof the tool or grinder, 'disposed in Jan Yimproved manner relativeto such irolls, fand :also to "provide such an improved machine which is :also icapable of' being linexpensively manufactured, has long liie in service', and requires less power fto'opera'teiit and -a minimum lof .-oiling. These .and other advantages of my improvements'will, however, hereinafter more fully appear.

AIn thezaccompanying drawing, Ilhavezshown rfor purposes vif illustration one embodiment which my invention may `assum'e fin practice, the same, while not limited thereto, being shown as {ap-l plied .to use :an cexternal grinder.

In this drawing:

, `'Figure i is aside :elevation "partially in section showing Vmy improvements applied Itol/a rstandard type of external grinder, the 'parts :being shown in their mid-position;

,'Fig. 2 is `an fend .elevation parfa'lly in ysection on line .2-#2 of Figure -1;

Fig. .3 is a view lsimilarto Figure 1 .but of only the upperpart of the machine and with therolls shown .in -tull fand .dotted l'lines Iextreme .positions lthereoffand o'f 'the work support, and

Fig-4 is n'afdeta-il perspective View of one of the rolls. i

fI'n this :illustrative construction, Ifhave shown my. inventionzapplied to la n:f grrinder having fa usual main fgrindingwheel I fandtsmaller'grinding wheel 2, `both suitably 'adjustable :on a `bed :3 relative to 'a usual Asupporti! onthe .main or bed iframe 5 of the maohinezand `relativeto the work, indicated at W and fcarried :in :a :usual :headstock i6 and -tailstook 1; Qon a worksupygiorting ybase member il which gisre'ciprooablelongitudinally to reciprocate the'workmelati-ve to the fparticular Wheel LI 101221 which 'is in -useand Awhile the wheel `is .r0-

tated in '.a usual manner.; this ibase member :8'

herein being supported on and .-reciprocated .by improved mechanism including .a pair V,of :spaced oscillating supporting yand feeding :rolls 9 {disposed between the member-Band themain Aframe 5., .all as hereinafter more fullydescribed. y

,Refer-ringmore )particularly to these -rolls 9, it Will/be `noted ,that each -ofathe .same is of ;.gen

arnetrically opposite points on 'the oscillating ,55 erally.crescent-shaped-cross seetion,fandthatfthe same are oppositely disposed relative to one another, so that longitudinally extending slots or openings Il) between the opposite longitudinal edges I I on different rolls face outwardly and away from one another in all positions thereof. It will also be observed that these members 9 are of substantially the width of the member 8 but of somewhat less width than an intermediate supporting member I2 which is disposed beneath and supports the member 8; the member 8 being adjustable angularly relative to this member I2 and rotatable on a pivot I2a and clamps 8a holding the table 8 fixed on table I2, after any angular adjustment, as for example, when grinding tapers or the like. Attention is also directed to the fact that each of the members 9 has a plu` rality of transversely disposed series of gear teeth I4 intermediate the ends of the member 9 and between smooth peripheral end portions I5 on the latter disposed above the roots of the teeth I4. These portions I5, as shown in Figure 2, thus act to provide oscillating load bearing surfaces cooperating with fiat surfaces I6 on the bottom of the member I2 and on opposite sides of a-` rack member or members I1, suitably removably attached to the member I2 and preferably embedded therein; the teeth on this rack member being adapted to cooperate with the teeth I4 on the upper ends of the members 9 when the latter are rotated, as hereinafter described. Further, it will be noted that while the teeth I4 may extend continuously around the outer periphery of the members 9, they are preferably, as herein, provided in a pair of spaced series adjacent the extremities of these members. Moreover, it will be noted that the stationary bed frame 5 has' a plurality of series of stationary rack teeth I 8 thereon, preferably also on a removable rack similar to rack I'I and adapted to cooperate with the teeth I4 on the lower ends of the rolls 9, and also iiat surfaces I8a corresponding to the surfaces I6 and adapted to support the load carrying surfaces I5 on the rolls.

Thus, it will be evident that when, for example, the members 9 are rotated to the right about their longitudinal axes by means hereinafter described, the support I2 and the work W thereon will be fed longitudinally to the right. Further, the support I2 will move from the intermediate position thereof shown in full lines in Figure 1, first to the extreme right hand dotted line position indicated in Figure 3, and then back through said intermediate position to the left hand position in-l dicated in full lines in the latter figure. In these positions, the member I2 is not only always-supported on the two rolls 9, but the latter roll to the right or left as the support I2 moves to the right or left. Moreover. note that not only do the rolls thus, in effect, automatically widen the support as necessary, but, in each position of each roll provide a support for the support I2 at diametrically opposite points on each roll.

Attention is also directed to the fact that the rack Il on the upper member I2 is suitably spaced at its ends inwardly from downwardly projecting end skirt portions I9 at the ends of the 'member I2, herein having usual troughs along their upper edges. Further, cooperating inwardly and then upwardly curved end enclosing members 2I are also provided at opposite ends of the top of the frame 5 at points adjacent the outer extremities of series of teeth I8 thereon; these members 2I also preferably having suitable grooves 22 at their lower outer ends, and having their inner ends 23 substantially spaced inwardly from the skirt portions I9 in the mid-position of the parts illustrated in Figure 1, and the upper extremities of these ends 23 only slightly vertically overlapping the lower extremities of the end skirt members I9. At each end of the two cooperating rolls 9 a stationary enclosing member 24 is also provided iixed to the bed frame 5 and extending up approximately to the bottom of the member I2 inside shorter depending cooperating side enclosing members 25 depending from the longitudinal edges of the member I2; cooperating ways 24a being formed at the top of the members as usual in such machines. Longitudinal troughs 26 are also provided along the top longitudinal edges of the member I2 and corresponding to and communicating with the troughs 20 heretofore described, while suitable bottom troughs 21 are also provided outside the members 24 and at the bottom thereof.

Thus it will be noted that an enclosing chamber 9a for the rolls 9 and their operating mechanism is provided between the top of the base 5 and the member I2, so that during operation, the rolls and their cooperating racks on the members I2 and 5 will be protected. Moreover, it will be evident that as the work support moves to the right or left beyond the ends of the base 5, the rolls 9 will be able to move into and out of the space above the upper ends 23 of the side members 2I and above these members, due to the slots I0 in the rolls, as clearly appears from Figure 3, all in such manner as to enable the rolls to perform their supporting function at different points laterally on the bed frame 5 as the rolls travel laterally with the work support relatively to the bed.

Controlling the various mechanisms on the work support is also any suitable controlling mechanism, the same, however, herein being disposed in an improved arrangement relative to the roll members 9 and in such manner as not in any way to interfere with the free movement of these members. Thus, the usual hand wheels 28 and 29 for the work table have usual operating and controlling shafting and gearing, but the shafting is disposed between the members 2I and adjacent the tops of the same and also extended through and journalled in the side members 24, while being provided Withany form of usual operative connection leading to the elements to be controlled thereby. Moreover, it will be noted that a rack member 30, which, as usual, is movable with the work support, is herein carried by and depending beneath the member I2 and disposed between one of the members 24 and the adjacent end of one of the rolls 9 so that it may cooperate as usual with the gears of the adjusting mechanism operated by the hand wheels.

Here also a usual lever operating rod 3| is carried on the outside of one of the side members 25 and at the bottom thereof in such manner that usual spaced stops 32 on this member 3| may reversely swing a usual upstanding reversing lever 33, herein carried on a shaft 33a between the rolls 9 and also journalled in the members 24, in such manner as to control the connection of a usual clutch mechanism 34 and thereby effect reverse rotation of the rolls 9; power herein being transmitted to the rack 30 in the chamber 9a by suitable driving gearing 35 and other cooperating driving gearing 35a from a power shaft 35 driven from any suitable motor (not shown) or, if desired, from suitable shafting. Obviously, the driving and controlling mechanisms may assume widely different forms, ample space being provided for the necessary connections within the chamber 9a without in any way interfering with the rolling movements of the rolls.

In the o-peration of the device, it will be noted that the rolls 9, while maintained in the same spaced relation to one another, move laterally with the work support or table as they rotate during each lateral movement of the latter. Thus, they thereby provide, in eii'ect, an extensible support for this table movable laterally therewith in either direction; the rolls 9 in the extreme right hand position of the table, shown in dotted lines at the right in Figure 3, assuming .the dotted line positions indicated therein, while in the extreme left hand position of the table, indicated in full lines in that figure, the rolls 9 assume the positions shown in full lines. Obviously, the length of travel of the work support or table may be varied as desired between these limits and the feed, as usual in such machines, may be effected by either hand or power.

The rollers, which support the upper bed or carriage from the lower bed and which are provided at each end portion with an arcuate cylindrical load-supporting surface, are of substantial diameter in relation to the length of the lower bed, so that, in a complete traverse of the full line position of Fig. 3 to y the dotted line position of said ilgure, each roller rotates through less than one revolution.

The roll members are in the approximate form of crescents, the open sides being disposed toward the respective ends of the machine. The driving connections for traversing the carriage are arranged at one end of the machine Where one of the rolls by reason of its open side clears these connections as well as the member 2| at that end of the machine. On each roll member, the series of gear teeth forengaging the carriage and the series of gear teethfor engaging the lower bed are in a median longitudinal plane whereas the cylindrical bearing portions having end parts engageable respectively with the carriage and the bed are disposed in vertical planes extending lengthwise of the machine on opposite sides of the median plane above mentioned. 'I'he gear teeth provide operative connections to the carriage and bed, whereby the roll members are maintained at all times in a predetermined relationship to the carriage and bed. The gear teeth provide means for actuating the roll members so as to shift the support for the carriage as the latter moves in either direction toward an overhanging position.

As a result of my improvements, the previous diiiiculties with the so-called see-saw condition and the wear incident thereto or arising therefrom, are eiectually overcome, due to the provision of adequate supports for the Work table at each end of its travel and the elimination of the previous unbalancing of the mechanism at the ends of the table travel. Attention is also directed to the fact that my improved construction makes possible an increased range of feeding movement oi' the work table for a machine oi a given length. With bearing rolls 9, an extremely rugged and long Wearing construction is produced as compared with the sliding frame of the prior art, and one which' requires only a minimum of attention to oiling. It will also be noted that the structure is such that both the rolls and the operator are vwell protected. While illustrated only as appliedto the longitudinal feed of a grinder, my improved structure may also be used for the cross feed if desired. It will also be apparent that the same may be used on other tools than grinders. These and other advantages of my improvements will, however, be clearly apparent to those skilled in the art.

While I have herein specifically described one embodiment which my invention may assume in practice, it will be understood that this form is shown for purposes of illustration, and that my invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a machine tool, a bed, a reciprocable bed movable relative thereto, oscillating supporting rolls between said beds and actuated by movement of said reciprocable bed for shifting the support for the latter in either direction of movement thereof, upstanding end members on said first mentioned bed, and chamber forming means in said rolls in which said last mentioned means are receivable during oscillation of said rolls.

2. In a grinder, a bed, a reciprocable bed movable relative thereto, grinding mechanism on said rst mentioned bed, a-Work support on said reciprocabie bed, actuating means for reciprocating said reciprocable bed, supporting rolls for said reciprocable bed between said beds and actuated by said actuating means to shift the support for said reciprocable bed in the direction of movement of the latter, enclosing means for said rolls including upstanding end members, and chamber forming means in said rolls receiving said upstanding members as said rolls are oscillated.

3. In a grinder, a bed, a reciprocable bed movable relative thereto, grinding mechanism on said rst mentioned bed, a Work support on said reciprocable bed, actuating means for reciprocating said reciprocable bed, supporting rolls for said reciprocable bed between said beds and actuated by said actuating means to shift the support for said reciprocable bed in the direction of movement of the latter, enclosing means for said rolls including forming means in said rolls receiving said upstanding members as said rolls are oscillated, and controlling mechanism for said grinding mechanism including operative connections disposed between said rolls and said upstanding members.

4. The combination with a. machine tool bed, and a carriage spaced upwardly from the bed and intended to be traversible to positions in which it overhangs the bed substantially at the respec- J tive ends of the latter, of approximately crescentshaped roll members interposed between the carriage and the bed, the open sides of the roll members being disposed toward thev respective ends of the machine, and driving connections for traversing the carriage arranged adjacent one endof the machine in a location in which the open side of the adjacent roll member permits the clearing thereof as the carriage is traversed.

JOHN JESIONOWSKI.

upstanding end members, chamber` 

